I think you would be better off starting with an auto Z28 and selling the six unless you can find a wrecked z for cheap. You could buy a running 93-95 z for less than the cost to convert a 6 to 8. In order to do the swamp, you would need an engine, new trany, all mounts, sensors, computer, harness, exhaust, etc. I not sure, but the master cylinder and the cooling system might have to be replaced as well. I know alot of the 6's(3.8) already have the 4L60E which is the same tranny as the z's. I don't know if they can take 550 hp without some mods though. I would also go with an aftermarket 12 bolt from Strange or another company, which can be set up to accept disk brakes. You could get rear disk on a 6 as along as it was ordered with the Y87 performance package which included the z's suspension and limited slip rear end with 3.42 in the auto. I think in 98 chevy made rear disks standard on the base camaro's. The only difference is the front springs are not a stiff as the z28s. Hope this helps.